From the Forums: Mastermind Game on the NeoPixel8x8

The object of the game is to correctly guess the hidden code. The code consists of 4 “digits” of six possible colors: Red, Yellow, Green, Blue, White and Black (here substituted with Magenta). Press the “Enter” button to choose among the six possible colors (advanced in order: Red, Yellow, Green, Blue, Magenta,White), then press the “Select” button to advance selection to the next column (currently selected column blinks). Once all columns are filled with selected colors and you are satisfied with your guess, Hold the “Select” button for 2 seconds and release to confirm your code (row will blink). Press “Select” again to finalize your code and view “score” feedback or “Enter” to cancel, allowing you to modify your code. Feedback is given in 4 columns next to your guess. Red LEDs indicate the number code digits that are the correct color and position, White indicates a correct color, but incorrect position.

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